Air-cooled generating unit for low-frequency apparatus



March 23 1926.

LA E..

1,577,747 H. B. HARTMAN AIR COOLED GENERA'IIING UNIT FOR LOW FREQUENCY APPARATUS Filed oct. 29, 1924 f INNER ELECTRODE Patented Mar. z3, 1926.

e STATES HARRY BUX'ION HARTMAN, OF SCOI'TDALF, PENNSYLVANIA, ASSIGNOR TO ELECTRIC WATER STERILIZ'ER AND ozoNE coMPANY, or soo'rTDA-LE,

CORPORATION OF PENNSYLVANIA.

1 ENNSYLVANIA A' AIRfcooLED GENERATING UNM: ron Low-FREQUENCY APPARATUS.

Applicationled October 29, 1924. Serial No. 746,692.

To all whom z't may concern.'

Be it known that I, HARRY BQ HARTMAN, a citizen of the United States, residing at Scottdale, in the county 'of lVestmoreland and AStatcf'bt' Pennsylvania, have invented certain new and Auseful Improvements in Air-Cooled Generating Umts for Low- Frequency Apparatus, of which the following is a specification.

This invention relates to ozone generators, and more particularly to an air-cooled generator of the type adapted for use in connection with low frequency currents.

primary object is' to provide a generator of the tubular type which maybe economically manufactured, and which will furnish a constant supply of ozone when 'dry air is supplied to it, thereby tion with machines for the purification of -water, ventila-ting apparatus or in the cheniical industries.

A furtherebject of the invention' is to provide a construction in which the generating portions may be readily washed out 'with water, without thenecessity of dismantling or taking apart thereby effecting a materialv saving `in time. iii keeping the apparatus in prime operating condition.

-Astill further object of the invention is toA provide a tubular generator construction utilizing a glass tube asv the-dielectric between the generating surfaces, the same having the ends tliereef'of reduced diameter topi-Ovide agraduated air gap between the end of the inner and outer electrode.

'With the above and other objects in view which "will more readily .appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts `hereinafter more fully described, illustrated and claimed.

A-pre'ferred and practical embodiment of the invention is shown in the accompanying drawings, in 'which:-

Figure l is a vert' Figure 2 is a horizontal sectional view taken on the line 2 2 of Figure 1.

Figure 3 is an enlarged detail sectional view of the joint'formed between the outer electrode and the end caps." i

Similar reference characters' designate nomically made,

particu# larly adapting the same for use in connecthe end caps C are ical-sectional view of the improved generator.

corresponding parts through the several figures of the drawings; i

As previouslyindicated, it is .one of flie objects of the' presentinvention to provide a generator construction which can be ecoand tothat end it is proposed to utilize standardized parts as much as possible, and to also eliminate dielectric elements which are likely to break down under the heat generated by the'oz'oneproducing brush discharge between the electrodes.

Accordingly. it is proposed to provide an outer tubular aluminum electrode lwliich is vcut from a long section of aluminum tubing and vprovided at the opposite lends thereof with the flanged rings 2;-2. These rings have a tight friction fit with the outside ot the tube adjacent the ends',`and .the flanges 3 thereof are provided Awith a centering recess 4 to receivev the annular shoulder 5 of a recessed end capdesignated generally as C. Adjacent the shoulder 5 the said cap is also provided with a flange 6 adapted to abut with the flange 3 so that suitable fasteningelements 7 may be utilized to connect the electrode 1 andthe cap C together. v

As will be observed from the drawings of duplicate construcdescription of onewill Th'ese caps are prefertion and therefore a apply vto the other.

ably of aluminum castings whose recessed` portions 8 communicate with the inside of the tubular electrode 1, and whose end walls 9 are provided with a central opening l() formed to receive suitable4 packing, and a gland member 11; The openinglO serves to center the ends .of the tubular interior dic- `le'ctric member D which is` preferably iliade of glass and isof relatively large diameter.

at its intermediate portion while the ends thereof which pass through the caps are ot s rnaller diameter, thereby providing 'a relatively restricted annular ozone generating chamber ,l2 between the body of the glass tube and the electrode 1,. and an insulating airl gap'lfof progressively increasing width (if) I at the ends of the tubular member where the same joins with the caps. i

VThe tubular dielectric member DA is pro- ,videdon its inner face with a surfacecoat- .fing of metal throughout the portion of terminating as indicated at l5 at the 14, the same extending large diameter dielectric and the ends.

llllmtion of the l'enlarged body `of the that the interior metallic coating 14 progressively recedes from .the electrode 1I to 'provide an insulating arr gap 13 of.' p rogressively increasing width, thereby having the effect of tapering off the brush discharge.4

to prevent its concentration and consequent damaging e ect on the dielectric, and to' prevent the passage of'spark discharges.

For the purpose of `establishing electrical contact withthe inter'iormetal coating 14 which is sprayed on the inside of the tube by any of the well known metal spraying-,processes now in use, there 1 s provided a novel contact member consisting ot the v,high-tension brass contact post 16 which has fitted thereto a plurality of radially extending glass centering rods 17 while the end thereof carries a pair of diyergent spring bronze contact lingers 18 having the rounded contactr ends 19 adapted to rest against the metallic coating. l. In practice the brass contact post 1G is connected to one side of the transformer while the casting' is connected with the ground side of the 'transformer to prevent anyone from vbeing injured. Fig. l of the drawing illustrates themanner of connecting the'casting with the ground side of the transformer' and the high tension contact post with the positive sideottlie transformer T. t

After the devi'cef is assembled as indicated in the drawings `it is set up in aperpendicular position, so that it may be kept cool by the thermal action ing Within and outside of the generator. If the ozo'ne lis taken ofi.' at atmospheric pressure, air enters the hport Sn of the lower or bottom cap C andpass'es upwardly from Q the recess 8 through the annular chamber 12 in which the brush discharge is. formed due Vto the action of the current Jumping from the interior metallic electrode 14 to -the outer metallic-electrode 1, and as the fair rises in the annular chamber it becomes may freely .in its pat r erator suiliciently lcool for working pur-l poses.

heated and also `ozonized, and th n vpasses out as ozone from the port, 8 o the upper casting. The air thus entering at the bottom and being ozone also serves to cool the generator, while it will of course be apparentV that. the outside electrode l gives oil its heat which rise and )ull cool air upwardly to keep t e outside of the gen- Also due to the fact. that the dielectric D of the device and thus maintain the proper temperatureconditions in the generator'. If the device is used in connection with inachines for the purification ot' water, the ozone may be drawn from the top ope ing Sby'an eductor operated by water,

It will thus'be seen,

lfittings apart.

oit cool air ris-- drawn from the top as'v and innerelectrode k14 are hollow .the air will freely pass through the interior while on thev used for ventilation, or in the chemical industries, a small blower may be connected to the upper `port 8a and air forced downwardly through the annular chamber 12, thereby making it necessary to take the yozone oifrom thev lower opening 8?.

ln addition to the advantages of manufacturing and assembling the present generator, I vprovide a construction which permits of being readily washed out without being taken apart. That is to vsay water may beinserted throu h the bottom open- 'ing 8 and discharged t rough the top opening 8 without the necessity of taking the Thatis of particular importance ,because when the device is used for generating ozone for air'ventilating apparatus the machines are in constant operation, thereby making it impractical to take the generator apart for cleaning and thus lose that much time. By flushing the same lwith water, the same may be readily and -qurckly cleaned, and thenA by temporarily turning on the blower before energizing the tube the water that does not drain out may be quickly evaporated.

. From the other hand .if the device is'` foregoing it is thought, that it will be apparent that the present construc- (generator including erating with said electrode to provide a'rell atively constrictedozone generating chamber, a mtallicelectrode carried by the in 'side face of the tubular dielectric, and

means for establishing electrical connection with the electrode carried within the tubular dielectric member. y

2. A tubular ozone generator comprising a tubular electrode and a tubular dielectric assembled therein, a tubular electrode formed by a metal coating adhering to the inner face of the dielectric, and means adapted to be projected within one of the open ends of the tubular dielectric to establish electrical contact with theinside electrode.

3. A. tubular ozone generator comprising an outer tubular electrode, recessed end caps detachably, fitted to said electrode and having ports, and a combined dielectric and electrode unit insertable Within said outer electrode'nd adapted to be held in said end.

caps, and means for establishing electrical gontact with the electrode portion of said Lerma-r tallic fingers adapted to engage with said inner electrode.

5. An air cooled ozone generator for low frequency currents comprising a tubular'l outer electrode, atubular interior dielectric member arranged within said outer electrode and spaced therefrom to provide an ozone generating chamber, a tubular metallic Aelectrode arranged Within the tubular dielectric member and adapted to be cooled by the thermal action of air currents passing therethrough, and means for establishing electrical Contact with the inner electrode through one of the open ends of the dielectric.

(3. A tubular air cooled ozone generator comprising a tubular outer metallic electrode, dielectric supporting means fitted to the ends of said outer electrode, a tubular dielectric engaged by said dielectric supporting means, a metal coating on the inside of the dielectricv member and constituting an inner electrode, and means for establishing electrical Contact with said inner electrode.

7. A tubular air cooled ozone generator comprising a tubular outer metallic electrode, vdielectric supporting means litted to the ends of said outer electrode, a tubular dielectric having the body and ends thereor1 of diierent diameter and engaged by said dielectric supportin means, a metal coating on the inside o the dielectricmember and constituting an inner electrode, `and means for establishing electrical Acontact with said inner electrode comprising a contact member having yielding sprino ingers adapted to be compressed to enter the small ends of the electrode and afterwards expanded into Contact with the metal coating.

8. A tubular air cooled ozone generator comprising a tubular outer electrode, closure means for the erid of the electrode, a tubular dielectric member having ends of small diameter fitted in said closure members and its medial portion of larger diameter lying within the tubular outer electrode thereby to provide an ozone generating chamber', a metal coating extending throughout the inside face of the part of the electrode of larger diameter and terminating at the junction of tie portions of large and small diameterv thereby to provide between the outer electrode and the inner coating an insulating air gap of progressively increasing width, and means for establishing electrical Contact with said metallic coating through the open end of the dielectric.

In testimony whereof I hereunto afiix my signature.

HARRY BUXTON HARTMAN. 

